Metals in the Environment

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node {
    stroke: #eee;
    stroke-width: 2.0px;
}

.link {
    stroke: #3B3F41;
    stroke-opacity: 0.2;
    stroke-width: 2.0;
}

#chart{
    width:98%;
    height:98%;
}

text {
  font: 12pt "Lucida Sans Unicode";
  pointer-events: none;
}

</style>

var margin = {top: -5, right: -5, bottom: -5, left: -5};

var width = 400 - margin.left - margin.right,
	height = 300- margin.top - margin.bottom,
    r = 17;

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var vis = d3.select("#chart")
    .append("svg:svg")
    .attr("width", width)
    .attr("height", height)
    .append('svg:g');

vis.append('svg:rect')
    .attr('width', width)
    .attr('height', height)
    .attr('fill', 'white');

d3.json("metals.json", function(data) {

var force = d3.layout.force()
        .nodes(data.nodes)
        .size([width + margin.left + margin.right, height + margin.top + margin.bottom])
        .charge(-500)
        .gravity(0.6)
        .start();

var node = vis.selectAll(".node")
        .data(data.nodes)
        .enter().append("circle")
        .attr("class", "node")
        .attr("r", function(d) {return d.size*2})
        .style("fill", function(d) { return d.color})
        .style("stroke", function(d) {return d3.rgb(d.color).darker(); })
        .style("stroke-width", 4)
        .style("opacity", 0.5)
        .call(force.drag)
        node.append("title")

.text(function(d) { return d.element; })

var texts = vis.selectAll("text.label")
        .data(data.nodes)
        .enter().append("text")
        .attr("class", "label")
        .attr("fill", "black")
        .style("text-anchor", "middle")
        .attr("dy", ".32em")
        .style("font-size", function(d) { return 13})
        .text(function(d) {  return d.element;  });

force.on("tick", function() {

node.attr("cx", function(d) { return d.x = Math.max(r, Math.min(width - r, d.x)); })
        .attr("cy", function(d) { return d.y = Math.max(r, Math.min(height - r, d.y)); });

texts.attr("cx", function(d) { return d.x = Math.max(r, Math.min(width - r, d.x)); })
         .attr("cy", function(d) { return d.y = Math.max(r, Math.min(height - r, d.y)); });

texts.attr("transform", function(d) {return "translate(" + d.x + "," + d.y + ")"; });
    });
})

</script>
</body>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js